package com.hddznet.uniplatform.sm.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class HdStringUtils {

	/**
	 * 将驼峰命名转化成下划线
	 * 
	 * @param para
	 * @return
	 */
	public static String camelToUnderline(String para) {
		if (para.length() < 3) {
			return para.toLowerCase();
		}
		StringBuilder sb = new StringBuilder(para);
		int temp = 0;// 定位
		// 从第三个字符开始 避免命名不规范
		for (int i = 2; i < para.length(); i++) {
			if (Character.isUpperCase(para.charAt(i))) {
				sb.insert(i + temp, "_");
				temp += 1;
			}
		}
		return sb.toString().toLowerCase();
	}

	/**
	 * 利用java原生的类实现SHA256加密     * @param str 加密后的报文
	 * 
	 * @param str
	 * @return
	 */
	public static String getSHA256(String str) {
		MessageDigest messageDigest;
		String encodestr = "";
		try {
			messageDigest = MessageDigest.getInstance("SHA-256");
			messageDigest.update(str.getBytes("UTF-8"));
			encodestr = byte2Hex(messageDigest.digest());
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return encodestr;
	}

	/**
	 * 将byte转为16进制
	 * 
	 * @param bytes
	 * @return
	 */
	private static String byte2Hex(byte[] bytes) {
		StringBuffer stringBuffer = new StringBuffer();
		String temp = null;
		for (int i = 0; i < bytes.length; i++) {
			temp = Integer.toHexString(bytes[i] & 0xFF);
			if (temp.length() == 1) {
				// 1得到一位的进行补0操作
				stringBuffer.append("0");
			}
			stringBuffer.append(temp);
		}
		return stringBuffer.toString();
	}
	
	public static void main(String[] args) {
		String secret = HdStringUtils.getSHA256("5eb5437f115916000a0284a1$4c150970");
		//f40dfdfa3f68c1f49a005010f6e47bedc4705573c36bd1168709e435880525e0
		System.out.println(secret);
	}

}
